During prolonged fasting, in what sequence are the following organic compounds used up by the body ?

(a) First carbohydrates, next proteins and lastly lipids

(b) First proteins, next lipids and lastly carbohydrates

(c) First carbohydrates, next fats and lastly proteins

(d) First fats, next carbohydrates and lastly proteins

Concept Questions :-

Respiratory Quotient
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At which step, glycolysis reaches the break-even point: 2
molecules of ATP consumed, and 2 new molecules synthesized ?

1. Splitting of fructose-6-phosphate to two trioses
2. Conversion of 1,3 bi-phosphoglycerate to 3 phosphoglycerate
3. Coversion of GADP to 1,3 biphosphoglycerate
4. Conversion of DHAP to GADP

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Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed?
1. pyruvate (present)-oxygen (present)-ATP levels (high)
2. pyruvate (present)-oxygen (present)-ATP levels (low)
3. pyruvate (present)-oxygen (absent)-ATP levels (high)
4. pyruvate (absent)-oxygen (present)-ATP levels (low)

Concept Questions :-

Oxidative Phosphorylation
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Plants can get along without respiratory organs because of all the following except:
1. Each plant part takes care of its own gas exchange needs
2. Plants do not present great demands for gas exchange.
3. Gas diffusion in plants occurs easily over long distances in plants
4. Each living cell in a plant is located quite close to the surface of plant

Concept Questions :-

Introduction
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Sucrose is converted into glucose and fructose by the enzyme:

1. Maltase
2. Zymase
3. Isomerase
4. Invertase

 

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The co-factor required for the activity of pyruvate dehydrogenase is:
1. Zinc
2. Magnesium
3. Manganese
4. Copper

Concept Questions :-

Aerobic Respiration
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In Kreb's cycle, a molecule of GTP is produced during the conversion of:
1. Citrate into Ketoglutarate
2. Succinyl-CoA into succinate
3. Succinate into malate
4. Malate into oxaloacetate

 

Concept Questions :-

Kreb's Cycle
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In the mitochondrial electron transport system the term Complex III refers to:
1. NADH dehydrogenase
2. Cytochrome c
3. FADH2
4. Cytochrome bc1 complex

Concept Questions :-

Oxidative Phosphorylation
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For each ATP produced, how many H pass through F0 from the intermembrane space to the matrix down the electrochemical proton gradient?

1. 1
2. 2
3. 3
4. 4

Concept Questions :-

Oxidative Phosphorylation
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What is the net gain of number of ATP molecules produced during aerobic respiration of one molecule of glucose?

1. 30
2. 36
3. 38
4. 40

Concept Questions :-

Oxidative Phosphorylation
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